The forums here don't allow files which are named .BIN.
There is also a file size limit of 256KiB.

Could I perhaps suggest that someone with phpBB site admin rights increase the file size limit to say 8MB to allow registered users to upload SaveGame.bin files (mine is a little under 5MB) and consider adding BIN to the list of allowed file extensions.
It might help with bug reporting too.

Even if the size were only increased to 600KiB, that would at least allow people to attach compressed copies of save files.

Otherwise, we're into the realms of Dropbox or GoogleDrive or Microsoft's OneDrive (urghhhh). Another level of complexity and another point of failure.